2025 Giant Bicycles Defy Advanced 1

	XS	S	M	ML	L
Stack	527mm	541mm	558mm	577mm	596mm
Reach	369mm	375mm	380mm	384mm	393mm
Stack to Reach Ratio	1.43:1	1.44:1	1.47:1	1.5:1	1.52:1
Seat Tube Length, C-T	410mm	445mm	482mm	515mm	535mm
Top Tube Length, Effective/Horizontal HT Top	515mm	530mm	545mm	560mm	575mm
Top Tube Slope	15.4deg	12.8deg	10.5deg	9deg	8.7deg
Head Tube Angle	70.5deg	71.8deg	72.5deg	72.5deg	72.5deg
Seat Tube Angle	74.5deg	74deg	73.5deg	73deg	73deg
Head Tube Length	120mm	140mm	150mm	175mm	195mm
Bottom Bracket Drop	75mm	75mm	75mm	70mm	70mm
Bottom Bracket Height	269.5mm	269.5mm	269.5mm	274.5mm	274.5mm
Chainstay Length	420mm	420mm	420mm	420mm	420mm
Chainstay Length Horizontal	413.3mm	413.3mm	413.3mm	414.1mm	414.1mm
Front-Center	586.6mm	585.6mm	589.5mm	600mm	614.9mm
Front-Center Horizontal	581.8mm	580.8mm	584.8mm	595.9mm	610.9mm
Wheelbase	995mm	994mm	998mm	1010mm	1025mm
Fork Offset/Rake	50mm	50mm	50mm	50mm	50mm
Trail	69mm high	60.6mm mid/neutral	56.2mm mid/neutral	56.2mm mid/neutral	56.2mm mid/neutral
Mechanical Trail	65mm	57.6mm	53.6mm	53.6mm	53.6mm
Wheel Flop	21.7mm	18mm	16.1mm	16.1mm	16.1mm
Standover Height	705mm	733mm	762mm	796mm	814mm
Tire to Pedal Spindle	72.1mm 170 mm cranks	71.1mm 170 mm cranks	72.5mm 172.5 mm cranks	83mm 172.5 mm cranks	95.4mm 175 mm cranks
Pedal Spindle to Ground Clearance	99.5mm 170 mm cranks	99.5mm 170 mm cranks	97mm 172.5 mm cranks	102mm 172.5 mm cranks	99.5mm 175 mm cranks

Published Sizing Recommendations

Height

157 cm

169 cm

165 cm

175 cm

171 cm

181 cm

177 cm

187 cm

183 cm

193 cm

Very Upright

Somewhat Upright

Average

Somewhat Aggressive

Very Aggressive

The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.

Category Trend

Source:https://www.giant-bicycles.com/tw/defy-advanced-1-2025